Image: Grapple Y test
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Description: The classic shape of the mushroom cloud rises above Christmas Island, flowing the Grapple-Y test on 28 April 1958. With a yield of 3 megatons, it was Britain's biggest nuclear explosion.
Title: Grapple Y test
Credit: https://web.archive.org/web/20070607113755/http://www.awe.co.uk/main_site/about_awe/history/timeline/1957/index.html
Author: Atomic Weapons Research Establishment
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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